So I really enjoy reading a book until I accidentally forgot the title of it and I forgot to bookmark it and subscribe to it. I really need help! Can you help me find the book that I was reading? 

Here is the somewhat description about the book:

its like fantasy aka super powers and stuff

I had a maid name Christina

I went to this shop and was given a necklace.

Then Luhan and Kai has to live with me and the other exo members will come later two at a time.